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How do we meet the water, energy, land and material needs of up to 9 billion people, while keeping climate change, biodiversity loss and health threats within planetary boundaries? According to the report, the growing demands placed on our supply of water are not only the result of population growth, but also the way in which our economies develop. Since 1900, humanity's water consumption has grown at twice the rate of population growth, jumping from 600 billion cubic metres in 1900 to 4,500 billion cubic metres in 2010.